OpenCloudOS-Kernel/arch/nios2
Alexandre Ghiti c4a05cf0ed mm: Introduce flush_cache_vmap_early()
[ Upstream commit 7a92fc8b4d20680e4c20289a670d8fca2d1f2c1b ]

The pcpu setup when using the page allocator sets up a new vmalloc
mapping very early in the boot process, so early that it cannot use the
flush_cache_vmap() function which may depend on structures not yet
initialized (for example in riscv, we currently send an IPI to flush
other cpus TLB).

But on some architectures, we must call flush_cache_vmap(): for example,
in riscv, some uarchs can cache invalid TLB entries so we need to flush
the new established mapping to avoid taking an exception.

So fix this by introducing a new function flush_cache_vmap_early() which
is called right after setting the new page table entry and before
accessing this new mapping. This new function implements a local flush
tlb on riscv and is no-op for other architectures (same as today).

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Stable-dep-of: d9807d60c145 ("riscv: mm: execute local TLB flush after populating vmemmap")
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-02-16 19:10:52 +01:00
..
boot nios2: dts: Fix tse_mac "max-frame-size" property 2023-06-13 16:59:46 -05:00
configs treewide: drop CONFIG_EMBEDDED 2023-08-21 13:46:25 -07:00
include mm: Introduce flush_cache_vmap_early() 2024-02-16 19:10:52 +01:00
kernel nios2: Replace all non-returning strlcpy with strscpy 2023-06-13 16:51:49 -05:00
lib treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 2019-06-19 17:09:07 +02:00
mm nios2: fix flush_dcache_page() for usage from irq context 2023-08-24 16:20:31 -07:00
platform nios2: Make NIOS2_DTB_SOURCE_BOOL depend on !COMPILE_TEST 2021-10-27 09:29:07 -05:00
Kbuild nios2: move core-y in arch/nios2/Makefile to arch/nios2/Kbuild 2022-09-29 04:40:14 +09:00
Kconfig mm/fault: convert remaining simple cases to lock_mm_and_find_vma() 2023-06-24 14:12:58 -07:00
Kconfig.debug NIOS2: fix kconfig unmet dependency warning for SERIAL_CORE_CONSOLE 2021-09-24 08:49:39 -05:00
Makefile kbuild: remove head-y syntax 2022-10-02 18:06:03 +09:00